On 26 Dec 2020, at 13:03, Patrik Schindler via cctalk <cctalk at classiccmp.org> wrote: Hello Folks, I?m having fun time to erase used DDS tapes for reuse. I?ve been collecting those over years. Recently, I discovered that with DEC brand tapes, the drive reports the cartridges to be write protected, eventhough the slider is closed which means, they?re supposed to be writable. I suspect there is a software write protect flag on them. Any thoughs, hints, advices how to unlock these tapes for overwrite? :wq! PoC